/**
 * Copyright (c) 2010, Casey Lai
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 * 
 * Neither the name of the Cheetah Group nor the names of its contributors may be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */

package org.cheetahworkflow.designer.command;

import org.cheetahworkflow.designer.model.Arrow;
import org.cheetahworkflow.designer.model.LogicNode;
import org.eclipse.gef.commands.Command;


public class RemoveArrowCommand extends Command {

	private LogicNode source;
	
	private LogicNode target;
	
	private Arrow arrow;
	
	public RemoveArrowCommand(Arrow arrow) {
		this.source = arrow.getSource();
		this.target = arrow.getTarget();
		this.arrow = arrow;
	}
	
	@Override
	public void execute() {
		source.removeOutgoingArrow(arrow);
		target.removeIncomingArrow(arrow);
		arrow.setSource(null);
		arrow.setTarget(null);
	}
	
	@Override
	public void redo() {
		execute();
	}
	
	@Override
	public void undo() {
		source.addOutgoingArrow(arrow);
		target.addIncomingArrow(arrow);
		arrow.setSource(source);
		arrow.setTarget(target);
	}
	
	@Override
	public String getLabel() {
		return "Remove Arrow";
	}
}
